*4.9. Carbon Dioxide Production*

The samples were analyzed using a digital gas analyzer (Quantek Gas Analyzer Model 902D, Quantek Instruments, Grafton, MA, USA) by inserting the device's needle probe into the packaging film, enclosing the sample to determine the CO<sup>2</sup> concentration. The CO<sup>2</sup> concentration was displayed on the device screen and was computed as the % CO<sup>2</sup> produced using the following equation [3]:

$$\text{CO}\_2 \text{ produced (\%)} = \text{CO}\_{2\text{fin}} - \text{CO}\_{2\text{in}}$$

where CO2in and CO2fin are CO<sup>2</sup> concentration on the first day, and at each storage interval.
